For example the question "Comma in compound/complex sentences" doesn't tell you enough information about its content. It's only by clicking through that you know what is being asked.

The goal of StackExchange is to help us build a great library of canonical answers. Having poor titles like that is counterproductive to that goal, because it makes searching the library much more painful than it ought to be. So, when you see a title that doesn't tell you what the question is, and you can improve, you should.

I wasn't aware that all posts on metas had to be questions. I only saw a problem while using English.SE and thought I'd mention it on meta since I'm unlikely to get the reputation to fix it myself any time soon.
– Borror0Jan 19 '11 at 6:25